Clients upload straight to object storage with pre-signed URLs. How should the backend learn that an upload finished?

Options

• ✗ Trust a "done" call from the client
• ✓ The bucket's event notification puts a message on a queue for a worker Correct
• ✗ List the bucket every second
• ✗ Read the load balancer's logs

Why

The client may crash, lie or lose its connection after uploading. The bucket knows for certain, and a queue between it and the worker keeps the event until it is processed.

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